M3.9 Earthquake 96 km SE of Attu Station, Alaska — August 12, 2024
2024-08-12 21:58:13 UTC (2024-08-12) · approx. 9:58 AM UTC+12 local
On August 12, 2024 at 21:58 UTC, a magnitude 3.9 shallow crustal earthquake struck 96 km SE of Attu Station, Alaska, at a depth of 41.6 km and coordinates 52.1637°, 174.0707°.
Physical scale: An earthquake of magnitude 3.9 releases seismic energy equivalent to roughly 11 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 296 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
174.0707°E
Technical Information
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Common Questions
How strong was the magnitude 3.9 earthquake near Attu Station, Alaska?
The magnitude 3.9 earthquake that struck 96 km SE of Attu Station, Alaska on August 12, 2024 at 21:58 UTC had a depth of 41.6 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 3.9 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.9 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us6000nppc). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, August 12, 2024). M3.9 Earthquake 96 km SE of Attu Station, Alaska — August 12, 2024. Retrieved October 26, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000nppc/